Tanith's Flame Armor

Flames race across your body taking on the appearance of a full suit of plate armor. The flames shed bright light in a 20ft radius and dim light for another 20 feet.

-The armor grants immunity to fire damage and resistance to cold.

-The armor also lets you add your spellcasting ability modifier to the total damage of any spell you cast that deals fire damage (functions in addition to elemental adept feat).

-Finally, any creature within 10 feet of you takes 2d6 fire damage per round; you can designate up to 5 targets you can see when you cast this spell to be unaffected by the damage